/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.grails.cli.compiler.grape;

import java.io.PrintStream;
import java.util.concurrent.TimeUnit;

import org.eclipse.aether.AbstractRepositoryListener;
import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.RepositoryEvent;
import org.eclipse.aether.transfer.AbstractTransferListener;
import org.eclipse.aether.transfer.TransferEvent;

/**
 * Provide high-level progress feedback for long running resolves.
 *
 * @author Phillip Webb
 * @author Andy Wilkinson
 */
final class SummaryProgressReporter implements ProgressReporter {

    private static final long INITIAL_DELAY = TimeUnit.SECONDS.toMillis(3);

    private static final long PROGRESS_DELAY = TimeUnit.SECONDS.toMillis(1);

    private final long startTime = System.currentTimeMillis();

    private final PrintStream out;

    private long lastProgressTime = System.currentTimeMillis();

    private boolean started;

    private boolean finished;

    SummaryProgressReporter(DefaultRepositorySystemSession session, PrintStream out) {
        this.out = out;
        session.setTransferListener(new AbstractTransferListener() {

            @Override
            public void transferStarted(TransferEvent event) {
                reportProgress();
            }

            @Override
            public void transferProgressed(TransferEvent event) {
                reportProgress();
            }

        });
        session.setRepositoryListener(new AbstractRepositoryListener() {

            @Override
            public void artifactResolved(RepositoryEvent event) {
                reportProgress();
            }

        });
    }

    private void reportProgress() {
        if (!this.finished && System.currentTimeMillis() - this.startTime > INITIAL_DELAY) {
            if (!this.started) {
                this.started = true;
                this.out.print("Resolving dependencies..");
                this.lastProgressTime = System.currentTimeMillis();
            }
            else if (System.currentTimeMillis() - this.lastProgressTime > PROGRESS_DELAY) {
                this.out.print(".");
                this.lastProgressTime = System.currentTimeMillis();
            }
        }
    }

    @Override
    public void finished() {
        if (this.started && !this.finished) {
            this.finished = true;
            this.out.println();
        }
    }

}
